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What is a brain abscess?

A brain abscess is a mass of immune cells, pus, and other material that can occur when the brain is infected by bacteria or fungus. A brain abscess is an infection in the brain that is encapsulated (confined within its own area) and localized to one or more areas inside of the brain. This condition may cause problems with the brain and spinal cord function. Brain

abscesses can occur in all children, but are more common in young school-aged children and occur twice as often in males than in females.

Brain abscesses commonly occur when bacteria or fungi infect part of the brain. Inflammation develops in response. Infected brain cells, white blood cells, and live and dead microorganisms collect in a limited area of the brain. This area becomes enclosed by a membrane that forms around it and creates a mass.

While this immune response can protect the brain by isolating the infection, it can also do more harm than good. The brain swells in response to the inflammation, and the mass may put pressure on delicate brain tissue. Infected material can block the blood vessels of the brain, further damaging tissues by causing cell death and swelling of additional cells. Multiple abcesses are uncommon except in immunocompromised patients.

Infectious agents gain access to the brain in several ways. The most common way is through infected blood. Ear and sinus infections may also spread directly to the brain because of their close proximity.

Symptoms may develop gradually or suddenly. There may be little or no sign of general infection throughout the body. Early symptoms are usually headache, muscle weakness, visual changes, difficulty with balance or coordination, or seizures.

People at higher risk include those with congenital heart diseases, such as Tetralogy of Fallot, and people with congenital blood vessel abnormalities of the lungs, such as Osler-Weber-Rendu disease. These disorders carry a high risk of infection of the heart or lungs, which can then spread to the brain. People with HIV infection or other conditions that compromise the immune system are also at higher risk.

More information on brain abscess

What is a brain abscess? - A brain abscess is an infection in the brain that is encapsulated and localized to one or more areas inside of the brain. A brain abscess is a mass of immune cells, pus, and other material.
What causes a brain abscess? - Brain abscess is an abscess caused by inflammation and collection of infected material coming from local or remote infectious sources within the brain tissue.
What're the symptoms of a brain abscess? - The symptoms of brain abscess are headache, drowsiness, confusion, seizures, hemiparesis or speech difficulties together with fever with a rapidly progressive course.
How is a brain abscess diagnosed? - The diagnosis of brain abscesses is established by a computed tomography (CT) (with contrast) examination.
What's the treatment for a brain abscess? - The treatment for brain abscess includes lowering the increased intracranial pressure and starting intravenous antibiotics.
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All information is intended for reference only. Please consult your physician for accurate medical advices and treatment. Copyright 2005,, all rights reserved. Last update: July 18, 2005